Good point as far as Sencha doing the work. I guess I interpreted the question more along the lines of "do they exist", and the answer is yes. I was surprised for the simple fact that someone as involved in the framework as you would give such a terse reply, making no mention of the wrappers that do exist. Was not questioning your opinion.

Does wrapping it in PhoneGap improve the performance of the App? Im finding running it in iOS is snappy (via Safari), but taking it to my actual device (galaxy s Android, 3GS iPhone) - it's a lot slower degrading the user experience.